Welding Neck Flange ANSI 150

QS Flange: Flange Wn ANSI 150

Welding neck flange with a tapered neck butt welded to the pipe, 1/2 to 56 inch at 150LB, SCH 5S to SCH160/XXS, RF face, to ANSI B16.5 and ANSI B16.47 A/B.

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One-Minute Overview

Welding neck flange with a tapered neck that spreads pipe stress away from the flange face.
Sizes 1/2 to 56 inch at 150LB, with wall schedules from SCH 5S to SCH160/XXS.
Raised face RF sealing, dimensioned to ANSI B16.5 and ANSI B16.47 A/B.
Carbon, stainless, alloy or duplex steel, for oil, chemical, gas and power piping.

A WN flange is butt welded to the pipe, and its tapered neck makes the wall thickness change gradually from pipe to flange. That transition spreads the load of a hot, cyclic or high pressure line along the neck instead of concentrating it at the sealing face. The series runs from 1/2 to 56 inch at 150LB, with bores cut to wall schedules from SCH 5S to SCH160/XXS.

Name: Flange WN ANSI 150
Type: WN
Size: 1/2 inch - 56 inch
Pressure: 150LB
Schedule: SCH 5S - SCH160/XXS
Flange Face: RF
Material: Carbon Steel, Stainless Steel, Alloy Steel, Duplex Steel
Standard: ANSI B16.5, ANSI B16.47 A/B

Order the bore together with the pipe schedule, because the neck is machined to the wall thickness and the range here covers SCH 5S through SCH160/XXS. The raised face takes a standard 150LB gasket, and the bolt circle and drilling are held to ANSI B16.5 and ANSI B16.47 A/B, so the flange bolts to standard fittings of the same size and class. Weld the neck to the pipe, inspect the joint, then bring the two faces together with the gasket in place and tighten the studs in a star pattern. Bodies in carbon, stainless, alloy and duplex steel let the flange follow the pipe metallurgy on oil, chemical, natural gas and power lines.

FAQ

Q1. What does the welding neck add over a slip on flange?

The neck is butt welded to the pipe and tapers from the pipe wall out to the flange body, so the section changes gradually and the stress of a hot or cyclic line spreads along the neck. A slip on flange sits over the pipe with two fillet welds and no such transition, which is why the WN pattern is chosen where pressure and temperature move.

Q2. Do I order by pipe schedule or by flange size?

Both, and they travel together. The bore is machined to the wall, and this series covers SCH 5S through SCH160/XXS from 1/2 to 56 inch at 150LB. Give the size, the schedule and the facing when you ask for a quote, and the flange arrives ready to weld to that pipe.

Q3. Can it take the hot end of my line?

That is what the neck is for. The tapered hub moves stress away from the sealing face while the raised face holds a standard 150LB gasket, and bodies come in carbon, stainless, alloy and duplex steel. Tell us the medium and the temperature and we will point you to the grade that suits it.

Q4. What is the smallest order I can place?

Standard flange insulation gasket kits start at one set, and standard gaskets, studs, washers and sleeves start at one piece. Parts made to your drawing or to a non-standard bolt pattern are quoted one by one, because the minimum really depends on the material and the tooling involved.

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